Thanks to such a fact more and more companies, which offer diverse products in the area of lightning intensify their efforts so that their goods would use significantly less energy than in the past. Hence, the expenses of their exploitation are in general thought to be substantially reduced, which is also referred to the fact that they are at present significantly more durable. Another reason why this area of industry has substantially developed throughout recent years is related to the fact that the demand on this kind commodities is continuously increasing. It is implied by the fact that not only new buildings are grounded, but also they are required in cities in the night in order to raise the safety of the citizens and for instance drivers of the vehicles. The more lights are available in a city, the more we are likely to avoid situations, in which we would participate in miscellaneous car accidents. Nevertheless, raise of the light bulbs in a city is related to greater costs rate, which proves that it is necessary to find an appropriate balance in the topic of lightning in terms of people, who are responsible for government of every city. Thanks to similar attitude they are likely to better care about the structure of a budget.